diff --git a/components/script/dom/dedicatedworkerglobalscope.rs b/components/script/dom/dedicatedworkerglobalscope.rs
index 00a00067e34..9263edeb3ef 100644
--- a/components/script/dom/dedicatedworkerglobalscope.rs
+++ b/components/script/dom/dedicatedworkerglobalscope.rs
@@ -618,6 +618,9 @@ impl DedicatedWorkerGlobalScope {
     }
 
     fn handle_mixed_message(&self, msg: MixedMessage, can_gc: CanGc) -> bool {
+        if self.upcast::<WorkerGlobalScope>().is_closing() {
+            return false;
+        }
         // FIXME(#26324): `self.worker` is None in devtools messages.
         match msg {
             MixedMessage::Devtools(msg) => match msg {
diff --git a/tests/wpt/meta/workers/WorkerGlobalScope-close.html.ini b/tests/wpt/meta/workers/WorkerGlobalScope-close.html.ini
deleted file mode 100644
index 24daae4c2e7..00000000000
--- a/tests/wpt/meta/workers/WorkerGlobalScope-close.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[WorkerGlobalScope-close.html]
-  [Test sending a message after closing.]
-    expected: FAIL